Wait you don't know about the plan? The master plan to make you lose because it's all about you! We have meetings to plan how to play pvp for our chance at losing so we get the elite loot and struggle to do pvp for our exotic bounties! BUT all that is secondary to making you lose!
Ok jokes over.
Serious reply.
I bet they are people who are trying to do exotic bounties. OR those trying to get rep for gear or doing queens wrath for rep/gear farming. They have no clue about maps and where people camp or how best to attack or defend spots. So they walk in to the match, get crushed, but have some more of their bounty, rep or gear farming done.